High Precision Silicon Nitride Ceramic Ball for Ball Bearing
Description:
Silicon Nitride has the most versatile combination of mechanical, thermal, and electrical properties of any technical ceramic material. It is a high performance technical ceramic that is extremely hard and has exceptional thermal shock and impact resistance. It surpasses most metals high temperature capabilities and has a superior combination of creep and oxidation resistance and high strength. Additionally, its low thermal conductivity and high wear resistance make it an excellent material that can withstand the toughest of conditions in the most demanding industrial applications. Silicon Nitride is an excellent choice when high-temperature and high-load abilities are needed.
Technical Parameters:
| Mechanical behavior | Unit | Al2O3 | SiC | Si3N4 | ZrO2 |
| Colour | ------- | Light yellow | black | black | white,black |
| Density | g/cm3 | 3.95 | 3.15 | 3.2 | 6 |
| Bending strength | MPa | 300～400 | 400～500 | 800～1200 | 950～1200 |
| Elastic modulus E | GPa | 380 | 350 | 300-320 | 210 |
| Poisson's ratio | | 0.22 | 0.14 | 0.26 | -------- |
| Hardness | Hv | 1800 | 2000～2500 | 1400～1700 |
1100～1300 |
| HRC | 80 | 85～90 | 75～80 | 70～75 |
| Fracture toughness | MPa·m1/2 | 3.0～4.0 | 3.0～4.0 | 5.0～7.0 | 8.0～10.0 |
| Maximum use temperature | ℃ | 1000 | 1300 | 400 | 400 |
| Thermal expansion coefficient | 10-6/℃ | 8.4 | 4 | 3.3 | 10.3 |
| | G5 | G10 G16 | G20 G28 G40 |
| ClassⅠ | Liquid oxygen pump,Active shaft bearing | The key parts of aerospace equipment | |
| ClassⅡ | Vaccum equipment,high speed instrument,mechanical devices,high performance and the most advanced contacting spherical propeller | Motor,medium-low precision star bearing | Testing bearing ball,separating bearing ball |
| ClassⅢ | | Sport,entertrainment,food processing | Mechanical devices |
Advantages:
1. High Strength over a wide temperature range.
2. High Fracture toughness.
3. High Hardness.
4. Outstanding Wear Resistance ,both impingement and frictional modes.
5. Good Thermal Shock Resistance.
Application:
Most ceramic balls are mounted in the bearing (high-speed bearing, high precision bearing, vacuum bearing, high/low-temperature bearing, nonmagnetic bearing, high precision ball screws) for the high technology industry, such as aerospace and national defense and etc. The ceramic balls can also be used for chemistry, metallurgy, medical treatment, food industry, oilfield, electronic engineering and etc.
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Silicon Nitride Ceramic Ball Machining Ceramic Parts For Ball Bearing Images
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